linux-4.4.1/dma_mmap_attrs() の履歴(No.1)

• 履歴一覧
• 差分 を表示
• 現在との差分 を表示
• ソース を表示
• linux-4.4.1/dma_mmap_attrs() へ行く。
  • 1 (2016-05-04 (水) 09:29:44)

参照元†

• linux-4.4.1/dma_mmap_coherent()(gen)

説明†

• パス: [[linux-4.4.1/]]

• FIXME: これは何？
  • 説明

引数†

• struct device *dev
  • linux-4.4.1/device
• struct vm_area_struct *vma
  • linux-4.4.1/vm_area_struct
• void *cpu_addr
• dma_addr_t dma_addr
  • linux-4.4.1/dma_addr_t
• size_t size
• struct dma_attrs *attrs
  • linux-4.4.1/dma_attrs

返り値†

• int

参考†

実装†

/**
 * dma_mmap_attrs - map a coherent DMA allocation into user space
 * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices
 * @vma: vm_area_struct describing requested user mapping
 * @cpu_addr: kernel CPU-view address returned from dma_alloc_attrs
 * @handle: device-view address returned from dma_alloc_attrs
 * @size: size of memory originally requested in dma_alloc_attrs
 * @attrs: attributes of mapping properties requested in dma_alloc_attrs
 *
 * Map a coherent DMA buffer previously allocated by dma_alloc_attrs
 * into user space.  The coherent DMA buffer must not be freed by the
 * driver until the user space mapping has been released.
 */
static inline int
dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr,
               dma_addr_t dma_addr, size_t size, struct dma_attrs *attrs)
{
        struct dma_map_ops *ops = get_dma_ops(dev);

• • linux-4.4.1/dma_map_ops
  • linux-4.4.1/get_dma_ops()

        BUG_ON(!ops);

• • linux-4.4.1/BUG_ON()

        if (ops->mmap)
                return ops->mmap(dev, vma, cpu_addr, dma_addr, size, attrs);
        return dma_common_mmap(dev, vma, cpu_addr, dma_addr, size);

• • linux-4.4.1/dma_common_mmap()

}

コメント†